What was the solution to this problem?
I'm having the same issue 
Are you using this URL for the App Templates in Settings?
https://raw.githubusercontent.com/SelfhostedPro/selfhosted_templates/portainer-2.0/Template/template.json
Yep that's the one.
Taken from: https://github.com/SelfhostedP…osted_templates/tree/OMV5
Works for me.
Isn't working for me. Going to downgrade for now unless someone has a solution. Worked on thsi yesterday and templaets showed up but now gone in portainer.
I think it's an unstable thing. I don't use the feature but when trying to set it up it either worked or didn't with no pattern to it.
I was having the same problem, (running on a raspberry Pi 4 and Ubuntu server)I upgraded to Portainer 2.9.2 and was using Novaspirts template :
https://raw.githubusercontent.…emplate/portainer-v2.json
But got the message
ZitatFailure to retrive template
I used the template above and it worked
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