In case someone fall into this, issue is tracked here:
to fix you have to go to Code section of your bridge and manually add serial number:
UID: mihome:bridge:XXXXXXXXXXX
label: Xiaomi Mi Smart Home Bridge
thingTypeUID: mihome:bridge
configuration:
ipAddress: 192.168.X.XXX
serialNumber: XXXXXXXXXXX
port: 9898
key: XXXXXXXXXXXXXXXX
serianNumber is the line you have to add
1 Like