@Manuel-Rangel it looks like the vpn is fine there is not much that can be the problem if the vpn works, 1. ACL on TP-Link router 2. ACL on ASA 3. Firewall that blocks the remote site on the device...

@MwaItou You should try and see :-) you must run the discovery tool on a windows pc on the same network as your devices, you cannot run it on a pc with the omada controller installed. there must also...

@GianfrancoPa Hmmm, try adopt wirelessly and then downgrade firmware. I dont know what happendt to your access point strange thing and I have same switch, after switch update i have to restart all...

@MwaItou you have to tell all your device where controller is located. you can use dhcp option 138 or Omada discovery tool. if you have omada router you have to use discovery tool on router.

@GianfrancoPa I dont think its bricked. I do some test earlier and it always come online. Mybee you should hard reset and downgrade before you adopt..

@GianfrancoPa Try deactivate 2.4ghz and try to downgrade. I do that with success after some try an fail.