BepInEx updater not working - Error code 403 - server not starting

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After stopping the docker and starting it again (through compose), I get the following messages resulting in the server not starting.

valheim  | Apr 17 21:01:13 supervisord: valheim-updater INFO - Valheim Server was updated - restarting
valheim  | Apr 17 21:01:13 supervisord: valheim-updater DEBUG - [40] - BepInEx is enabled - running updater
valheim  | Apr 17 21:01:13 supervisord: valheim-updater INFO - Valheim Server was updated from Steam - signaling BepInEx updater to merge updated files
valheim  | Apr 17 21:01:14 supervisord: valheim-updater curl: (22) The requested URL returned error
valheim  | Apr 17 21:01:14 supervisord: valheim-updater : 403
valheim  | Apr 17 21:01:14 supervisord: valheim-updater FATAL - Error: could not retrieve BepInEx release info from Thunderstore.io API
valheim  | Apr 17 21:01:14 supervisord: valheim-updater ERROR - Failed to run BepInEx updater - retrying later - check your networking and volume access permissions

The server starts again, when BepInEx is set to false in the .env file. PUID and PGID are set to 1000.