I created a shared mailbox that was an alias before. The alias was removed from the user that had it, but the shared mailbox doesn't work.

If I set another name to the shared mailbox, it works, but that's not what I want obviously
(I'm on debian 12 with these packages)
root@mail:/home/debian# apt list --installed 2>/dev/null | grep -i grom
grommunio-admin-api/unknown,now 1.19.11.mc7e4cbd-1+5.1 all [installed]
grommunio-admin-common/unknown,now 50.10f1afb-1+51.2 amd64 [installed]
grommunio-admin-web/unknown,now 5.0.0.32.a076725-1+172.1 all [installed]
grommunio-common/unknown,now 29.9-1+19.1 amd64 [installed]
grommunio-dav/unknown,now 1.6.24.84942ef-1 all [installed]
grommunio-dbconf/unknown,now 1.1.2.4bbae9a-1+15.2 amd64 [installed]
grommunio-error-pages/unknown,now 1.0.10.bb2df37-1+22.3 all [installed,automatic]
grommunio-index/unknown,now 1.5.0.gb0a01b9-1+2.2 amd64 [installed]
grommunio-setup/unknown,now 1.3.0.g6ae8001-1+4.1 all [installed]
grommunio-sync/unknown,now 2.4.8.483c521-1 all [installed]
grommunio-web/unknown,now 3.18.7.gec5085ffd-1+481.1 all [installed]
gromox/unknown,now 3.7.256.me40a504-1+46.1 amd64 [installed]
system-user-grommunio/unknown,now 9-1 all [installed,automatic]
system-user-gromox/unknown,now 9-1 all [installed,automatic]