There was no need to Deactivate the older version of LR and PS.
I suggest you do a Reinstall of both LR CC and PS CC. To do that you will more than likely need to Uninstall both of them first.
Once Reinstalled open the CC desktop app and make sure all are Up To Date (Which they should be)
Could be during the Deactivation of the older versions it broke the link between LR CC and PS CC for the Edit In option.
Thanks for reply but afraid it didn’t work at all. I now have no Photoshop CC, no Lightroom CC and when I try to uninstall Creative Cloud it tells me I can’t because I have applications that need it!
Can’t open CC either so I now have NO CC applications or software at all.
Reinstall LR and PS from the CC app.
Lr first then Ps