Used to work 2 years ago with different SSID
And the question/issue is ???
Not the “years” or the “SSID” is important for changes here, but the ROS version could change some things.
e.g. Like MT DHCP server over station-pseudobridge has DHCP lease difficulties since 6.38 (http://forum.mikrotik.com/t/ros-6-38-serious-dhcp-server-problem/105259/1)
DIdn’t say this is happening here, but it could be this. Is the client device using DHCP? Then test first with a static IP address.
“pseudobridge” needs the client to communicate first, before it is reachable
Did the wifi connect? (SSID security could have been changed in 2 years).
Is that admin-mac still unique?
If the host AP for the mAP is also a MT, then use wifi mode “station bridge” , not “station pseudobridge” as needed only for connection to other AP brands.
Use “station bridge” if you can, far superior to “station pseudobridge”. “Station bridge” with Mikrotik’s is full 4-address mode wifi (transparent like ethernet connection)