Mac mini didn't go into sleep mode when i am conect my thunderbolt display whit an optical thunderbolt cable

hello my mac mini didn't go into sleep mode when i am using an optical thunderbolt cable to my thunderbolt display
has any body els this problem

Hello josfromkerkade.  Please contact me so that I can get more details. 
We'd like to understand which monitor you're using, how old it is, which Thunderbolt port you're using (tethered cable or TB port), & the version of firmware. 
[email protected]
Thanks, Mitch

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