After a nightmarish day (with a robus computer and FULLY updated PP and AE and OSX) of trying to get a set of clips in PP timeline to port over to AE for some FX work, and getting nonstop errors ("After Effects 2021 must be installed on this system..." and other such errors), or having the "replace with After Effects" tool be greyed out for no obvious reason. After reading online that users have been having this issue for a number of years, I finally decided to look to Adobe tech's for help. I figured we pay for this subscription every month and if they have a glitch like this, it's up to Adobe to resolve it. I'm happy to report that they did. And the tech who finally resolved the issue suggested I share on here that they DO have a solution. It's a lengthy one and does require giving them control of your computer. But it finally got resolved.
My suggestion if you're having this issue is to get a Tier 2 level support or someone a bit higher up the food chain. My first tech rep was obviously reading from a script and didn't fully understand the issue. When he told me he couldn't help unless I disconnected my 2nd and 3rd monitors, and I pushed back a bit (that's a HUGE hassle on my system), a higher level tech QUICKLY jumped in to take over. It took him a good 30-40 minutes and LOT of adjustments on my system to get the two apps to integrate.
But it resolved the issue and I've been happily back to work all night with a fully functioning Adobe integration.
So, do yourself a favor. Find the link to online help and push through the virtual assistant and Tier 1 tech's and get someone who can resolve this issue. Like I said, it's a very involved fix and in watching them control my computer, I was glad I didn't have got resort to reading a slew of hacks online to hopefully recreate what the tech did.
Editing, Error or problem, User interface or workspaces
Thanks for reporting this here. The Adobe help system can be spotty, some get great help, some don't. You finally got one of the really good ones so hooray!
I know Product Support staffer @Kevin-Monahan always suggests any video user always ask immediately for the video que on getting either a live phone or chat helper. This gets you up and out of the generalist help staff at least. But going for a Tier 2 support staffer is another good thing to know to ask for.