Not usually a problem for me. Did you try the HDMI splitter trick again? That would have been my next move.
Just finished a house where a splitter was randomly needed for an AT&T uVerse box and Integra receiver. That was 6-7 years ago. Now client has Comcast, same Integra, no splitter needed. Random stuff.
That’s why techs have no hair after a certain number of years in the biz.
There is no truth anymore. Only assertions. The internet world has no interest in truth, only vindication for preconceived assumptions.