There are two Coinbase commerce the self-managed and Coinbase-managed you might be created a self-managed one that generates 12-phase seed backup which is why it only supports USDC.
THAT'S it! CB Support also sent me an answer with correct link to self-managed dashboard with exactly that as a reason. Thanks!
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Glad that you're able to sort out this issue, now you can conveniently use two different coinbase wallets for your two different shops. I don't use coinbase, I'm just in this thread to learn with you, and I'm glad that you went to their reliable source, the support service.
Crypto understanding is very vast, it's not easy to acquire every knowledge, this is why this forum is a store of crypto knowledge value.