Sadly Sandra did not acknowledge HIS support. The only one she missed. I think that is sad.
Some things don’t have to said between people or acknowledged...they simply know.
He may have asked her not to, they had a conversation before she stood up to accept her award.
Sandra did acknowledge Jessie, just didn’t say his name. When she was talking about her mother’s guidance, etc., said that was the reason she ended up with him (pointed the Oscar towards him in the audience) and ended up with the Oscar.
So, yes, she did acknowledge her husband. Watch the replay on youtube.