I found the answer here: 
https://apple.stackexchange.com/questions/441313/no-mailbox-doesnt-exist-separator-woes-in-mail-app-dovecot-interaction/441341#441341

Apparently on Mac one needs to update the separator on a file, since it doesn’t 
seem that the Mail.app does it for itself.

On the iPhone it happened automatically.

Best,

Francis 
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