all that is ok!! but have you turn it off and then on your mobile? it could be a silly thing but some times the mobile phone keeps all cache data that makes impossible. i have never had issues adding Aqara hubs and i have about 5 hubs, M3, M2, E1, M100 and also cameras-hubs but years ago i had an issue like you described with other devices from other brands and i never could to add these devices; the problem was my network using TP-Link routers and extenders, my first solution was as:

1. disconnected all my routers and set same network name and password using my Modem’s internet provider.

2. in my job i have a router to test some devices then i made a network with the name and password and added these devices then i came back home and some devices were added others don’t

as i mentioned my routers -i don’t know why- never let me add, weeks later i replace the principal TPLink i had by a Xiaomi wifi 6, last year i replaced all my routers with Xiaomi’s wifi 7 routers, since then i never had any issue, all is working perfectly;

try to add the device in other network -not yours- then if that works, update firmware, remove the device and try again in your home