Trying to input the ISRC from this album https://tatsumo.pythonanywhere.com/album/5Eh4g0AuSoFT5xc0vOG324 will display the following error message.
ISRCs must be in valid ISRC format
For usage, please see: MusicBrainz API - MusicBrainz
I’m guessing because the ISRC format used for the tracks have hyphens, e.g. GB-SMU-23-99532