Sounds like a problem with Memmy. Does this link work? https://lemm.ee/c/sfah@hilariouschaos.com
You should be able to search communities in your app and could have searched “sfah@hilariouschaos.com” too.
But basically communities on Lemmy are in the form of “name@host”. The “name” can be whatever someone wants, and the “host” is the website / Lemmy instance where that community originates from. But because it is federated it’s all available everywhere (generally speaking). For example, if you visit https://lemmy.world/c/sfah@hilariouschaos.com it should be the same content just loaded via lemmy.world instead of lemme.ee. However if theoretically someone went and made a “sfah@lemmy.world” community, that would be a completely separate community from the above, hosted on a different Lemmy instance.
I really enjoyed my time with it, even though I’ve not played many games in this “style”.
The campaign is quite lengthy even though it’s not finished yet, so you’ll definitely get your money’s worth.