Looking for a fix for (No soup for you! The server you're trying to access doesn't want to let you in. Make sure you're signed in as a user with access to this server.)

[ChuckPa]

what is the IP address of the computer you are using?
what is the IP address of the Synology?

Synology FAQ - Questions, Answers, and How-To's

FAQ 22 - Hard reset server credentials. DSM 7 - Uninstall with the “Keep” option [Screenshot from 2022-08-25 11-33-36] Install the same version package again, – Plex Claim Token method – Click “Get Plex Claim token” – Browser will open and show claim-xxxx token – COPY the token to browser (do not waste time. Token expires in 5 minutes) – Return to installer window – PASTE into token window on installer form [Screenshot from 2022-08-25 01-33-20] – Click NEXT & DONE and continue…