HDR stopped engaged on TV with Xbox

My sequence x has for some purpose stopped HDR working with my TV, I seen the change after I used it with a unique monitor, the monitor has pretend 400 nits HDR so I simply flip it off as a result of it finally ends up wanting higher however now my TV which I've used with HDR since I purchased the sequence x gained't work it doesn’t matter what settings I play with on my Xbox or TV. Has anybody had this drawback or have any possibe options?