It looks like Monterey can't share it's own files via AFP, since it's only using the new APFS file format.
See this link: https://www.macworld.com/article/234...to-change.html
It's not clear if Monterey can see files from your old Mac Mini via AFP, since the article above is only up to Big Sur. It states that Big Sur can still see AFP shares from other computers, but this may or may not still be the case in Monterey.
What all this means is that the old Apple Filing Protocol (AFP) is problematic with the latest Mac computers. Your old Mini will be sharing using AFP, but there's no way it can see any file or drive being shared by the M1. It still might be possible for the M1 to see the drives or files being shared from the old Mac Mini. You'll have to try it. Turn on file sharing in your old Mac Mini, and make sure you've also enabled sharing for the drive you want to share in your old Mac Mini. In your M1 check if the drive from your old Mac Mini shows up in the network.
If you can't see your old Mac Mini drive in the M1 network, the next option is to use SMB instead of AFP. You'll have to change from AFP to SMB sharing in the option settings for sharing in your old Mac Mini. Your M1 should be able to see SMB shares, since that's what Apple now uses now too.
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