Persistent error=server_error on /authorize for one specific account (all apps, all devices)

[leochan123]

Plan

Premium

Title: Persistent error=server_error on /authorize for one specific account (all apps, all devices)

Hi all,

I'm unable to complete the OAuth Authorization Code flow for any app on my account. Every single attempt returns:

http://127.0.0.1:8888/callback?error=server_error&state=split-playlist-app&ubi=...

This happens right after login/Agree, before any authorization code is ever issued.

What I've ruled out so far:
- Redirect URI exact match confirmed (http://127.0.0.1:8888/callback), no typo/trailing slash
- Recreated the app from scratch with a new Client ID/Secret — same error
- My account is listed in the app's User Management
- Logged in via Facebook and via direct email/password — same error both ways
- Tried Chrome normal + incognito, and fresh incognito sessions — same error
- Tried a different network (mobile data vs home wifi) — same error
- Tried a completely different laptop — same error
- Explicitly set a non-empty 'state' parameter (in case of the known empty-state 500 bug) — same error, so this isn't that

Given this is identical across apps, browsers, devices, and networks, it looks tied specifically to my account on Spotify's side.

I have several full redirect URLs with the 'ubi' tracking parameter if a Spotify team member can trace this internally. Happy to share Client ID(s), timestamps, or anything else that helps.

Has anyone seen this exact pattern before, or know what could cause an account-level block on the /authorize step specifically?

Thanks