The current version of Keychat supports creating multiple IDs, but each ID is generated from a different seed phrase.
We have listened to user feedback, and in the future, we will enable generating multiple IDs from a single seed phrase. Therefore, if you are currently trying to create multiple IDs, consider that IDs beyond the first one may no longer be supported in a future version.
By the way, the seed phrase for your ID is also the seed phrase for your cashu sat.