Audi A8 D3 4.2 (BFM): Diagnosing Loose Timing Belt Between Rollers - Chain/Belt Tensioner?

The problem is as follows, Audik started to howl, I pulled the belt cover and the belt is very loose between the rollers (at the top), from the rollers down the belt is tight, I do not know if this may indicate a chain tensioner or a belt tensioner? I just can't find the cable to check with VCDS if the error of any of the chain tensioners has not popped out ...

Preview photo (not mine, downloaded from the inet), where it is marked in red, the bar is loose.

Buddy, sometimes the shaft is not torn a little ?? Have you checked ??