Microsoft Account Access Blocked Due to an Old Encoded Full Name

An old display name isn’t enough to establish what’s causing the loop. Also, your profile name, sign-in email aliases, and security verification details are separate settings—updating one doesn’t automatically replace the others.

First, try opening Your info in a private/incognito window and sign in with the affected account. If it works, change the name there, then clear Microsoft sign-in/account site cookies in your usual browser. That will sign you out of those sites, but won’t delete your account or files.

If the same loop happens in another browser or device, contact Microsoft Support and describe it as “personal Microsoft account profile pages stuck in a sign-in/redirect loop; sign-in itself works.” Include the affected page URLs, when it started, and a screenshot with personal details hidden. Mention the unusual display name as a possible clue, rather than a confirmed cause. Ask for escalation to the team that handles account profile issues; a frontline agent may not be able to edit the name manually.

For the old phone and email, check Security separately if it opens. A new Outlook address or sign-in alias isn’t automatically a recovery address. If Microsoft shows a pending security-info replacement, follow the date shown—it can involve a 30-day waiting period.

Keep any working sign-in session open while this is being investigated, and don’t remove your remaining working verification methods.