You unboxed the Echo Show 21, plugged it in, and the screen lit up. Then the Alexa app on your phone can't find it, or the QR scan keeps giving errors, or the setup pauses indefinitely at "Connecting to Wi-Fi." The largest Echo display Amazon has ever made is sitting there like a very expensive digital picture frame.
This usually comes down to one of a few things: your phone and the Show 21 are on different Wi-Fi bands, the Alexa app doesn't have the right permissions, or the device needs a fresh reset before it'll pair. Let's work through them.
Make Sure Your Phone Is on the Right Wi-Fi Band
The Echo Show 21 supports Wi-Fi 6E, so it can use the 2.4 GHz, 5 GHz, and 6 GHz bands. But during the initial setup handshake, your phone needs to discover the Show 21 via Bluetooth Low Energy, and the Show 21 needs to hear the Wi-Fi credentials you send through the Alexa app. If your phone is on a 5 GHz-only or 6 GHz-only network while the Show is trying to broadcast its setup network on 2.4 GHz, they'll never connect.
Go to your phone's Wi-Fi settings and make sure you're connected to a 2.4 GHz network before starting Alexa app setup. If your router uses the same SSID for all bands, temporarily disable the 5 GHz and 6 GHz radios (or use the router's guest network on 2.4 GHz only) for about 10 minutes. Once the Show 21 is paired and connected, you can turn them back on.
Reset the Echo Show 21 Before Pairing
If this unit was ever set up before (maybe you bought it open-box, returned, or it was configured in a different home), it won't pair with your account until it's factory reset. On the Echo Show 21, go to Settings > Device Options > Reset to Factory Defaults. Confirm the reset, and the screen will go dark and restart. After about two minutes, you'll see the welcome screen again. Now open the Alexa app and start fresh.
I've seen this fix catch people off guard. The Show 21 has a built-in Fire TV interface, and sometimes a previous owner set it up as a Fire TV without ever doing a full reset. The factory reset clears all of that.
Give the Alexa App the Permissions It Needs
The Alexa app needs Bluetooth, Location, and Local Network permissions to discover the Echo Show 21 and complete the setup handshake. If any of these are denied, the app will hang at "Searching for devices" without ever telling you why.
On iPhone, go to Settings > Privacy and check Bluetooth, Location, and Local Network for the Alexa app. On Android, check under Settings > Apps > Alexa > Permissions. If Location was set to "Allow only while using," that's fine. But if it's set to "Deny," the BLE handshake won't work. After enabling them, close the Alexa app fully and reopen it before trying setup again.
Check Your Wi-Fi Password for Anything Tricky
The Echo Show 21 sends your Wi-Fi credentials through Alexa's setup flow, and certain special characters can trip up the handshake. Percent signs, ampersands, backslashes, and quote marks are the usual culprits. If your Wi-Fi password contains any of these characters, change it temporarily to a simple 10-character alphanumeric password just for setup. You'll change it back afterward.
Once the Show 21 is paired and online, go to the Alexa app, tap Devices > Echo & Alexa, select your Show 21, tap the gear icon, and update the Wi-Fi password to the original one with the special characters. The Show's software handles credential updates better than the initial setup flow.
Stand Close to the Screen During Setup
Setup uses Bluetooth Low Energy for the initial discovery phase. BLE has a practical range of about 15-20 feet through walls. If your phone is in the living room and the Show 21 is mounted on the kitchen wall, the BLE signal can drop before the Wi-Fi handshake starts. Walk up to the Echo Show 21 with your phone, start the setup process, and keep the phone within arm's reach of the screen until the app confirms Wi-Fi connection.
The Echo Show 21 ships with wall-mounting hardware, so it's common for people to mount it first and then try to set it up from across the room. Do the setup first on a table near your router, then mount it.
Check Your Account Region
Alexa accounts are region-locked. If your account was created in one country and the Echo Show 21 was purchased or belongs to a different region, pair can fail at the registration step. Open the Alexa app, tap More > Settings > Account Settings and check your country. If it doesn't match the country where you're currently using the device, you'll need to create a new account for that region, or contact Amazon support to transfer the device between regions.
If the Screen Shows Scaling Issues After Pairing
A known issue with the Echo Show 21's 21.5-inch panel is that some older Alexa Skills don't scale correctly, leaving blank bars or stretched UI elements. This isn't a pairing failure, but it can look like something went wrong during setup. Open the Alexa app, find the Skill in question, and check if there's a Smart Home Skill interface update available. Many developers updated their Skills to support the 21-inch display in late 2024, so a simple update resolves it.
Reinstall the Alexa App
If the Alexa app has been through several failed pairing attempts, its local cache can get stuck in a broken state. Delete the app from your phone, restart the phone, then reinstall it from the App Store or Google Play. The Alexa app requires iOS 13+ or Android 9+, so confirm your phone meets that. Sign back into your Amazon account and start the pairing process from scratch. This clears any stale session data from the previous attempts.
