Did you have any other changes to your system (updates, new applications installed, etc)?
I've bumped into a problem, when connecting Rekordbox with my phone it remains stuck on the following.

I've gone and cleared the cache and data of the Mobile app. Uninstalled the app but the problem persists even when leaving it connect for over 15 minutes.
Tried it with the laptop connect to wifi and with ethernet.
Didn't have any issues last week when I was on the same version of the app and RB desktop.
What are the steps I can take?
Rekordbox 6.5.1 (and also with the 6.5.2 beta)
Rekordbox Mobile 3.0.2.14
MacOS 10.15.7
Android 11 (RQ2A.210.505.002
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Did you have any other changes to your system (updates, new applications installed, etc)?
(Just realised my reply didn't go through)
Ok, solved, sort of. I got the inspiration from: https://forums.pioneerdj.com/hc/en-us/community/posts/900002052666/comments/900002437563
Installed an older version of Rekordbox on my laptop which I kept on a backup drive. After doing this connecting between the devices worked again. Then proceeded to update to 5.6.1.
This however has let to a new problem, my grids and album art aren't showing.
To answer your question Pulse, a new MacOS update and VDJ were installed. VDJ wasn't running when I tried the sync but it was still installed. I uninstalled it.