Answer first
If business email works on a computer but not on a phone, the account is probably active. Check mobile app password prompts, mailbox storage, app permissions, server settings, and whether the phone needs an updated sign-in session.
Review the phone app, permissions, saved password, mobile network, and security prompts. Do not delete the account until you confirm backup and sync status.
Compare Wi-Fi and cellular data, check whether calendar and contacts sync, and confirm the phone date and time are correct.
Keep the phone model, email provider, app name, error message, and whether webmail works ready for support.
Quick FAQ
Why does email work on my computer but not my phone?
The mailbox is likely active, but the phone app may have a password, permission, server setting, storage, or security-session issue.
Should I delete the email account from my phone?
Only after confirming backup and sync. First test webmail, app permissions, internet, and password prompts.