There is a bug on blynk platform
1 create a template with a device
2 transfer to another user
3 the user deletes the template by mistake
4 you still have the template on the admin account
5 you can no longer delete it
6 the template is definitively lost 
1 /
4/
5/
The user within your org or suborganization?
You can’t delete template with active devices.
User within my org
but don’t worry it’s just a test , not a real user, just an other mail address of mine
One device offline
Since I create a bug
I can’t edit none of other templates,nor create new templates, nor edit the dashboard
I got " An unexpected error occurred. " each time
I delete the second account, but no change .
Action Log
Solved !
I don’t know why, but it seems firefox 89 stuck with the platform since I delete the template.
I will try safe mode. 
Works well with Edge
PS:
I ran Firefox repair mode, everything is fine now, I think it was caused by a plugin!
Done
I fix it with Firefox repair mode , tell me if you find what happened.
Thank you.
