Additional features, settings, or issues not covered by specific Microsoft Teams categories
Hi ShabirJan,
I have consult related engineer, since the iOS and Web side can login to Teams normally, so the account should be OK. to check if it's caused by the DNS resolution failed, please go to Settings > Network & Internet > Tap the menu button (three vertical dots) > Network settings reset > RESET SETTINGS to reset his phone’s network to check it.
Meanwhile, to confirm if any group policy is assigned to this domain to block the Android devices to access the Teams for Android. please go to connect to Exchange Online PowerShell, after connecting successfully, then input following cmdlets and check the result.
Get-GPO -All -Domain "sales.contoso.com"
(Note: sales.contoso.com is your domain)
If it still doesn't work, to do further troubleshot and help you better, we also need to collect additional log information, please check my PM and share the log information for us in Private Message.
Regards,
Bryan