Instead of using trying to link to the folder which would require a URL like https://github.com/potatoqualitee/twitch/blob/main/tvclient you might link to the root project instead https://github.com/potatoqualitee/twitch (have seen other projects do this when they are storing the modules in the same repo).
Seems the link used in the psd1 for the ProjectUri is not resolving to the folder in the project.
https://github.com/potatoqualitee/twitch/blob/dc1336393d7f5bba2d14d7f59564ea5f06b67c49/tvclient/tvclient.psd1#L96-L97
Instead of using trying to link to the folder which would require a URL like
https://github.com/potatoqualitee/twitch/blob/main/tvclient
you might link to the root project insteadhttps://github.com/potatoqualitee/twitch
(have seen other projects do this when they are storing the modules in the same repo).