Confidentiality breach at work?

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Person A is a manager. Person B is a member of staff who has returned from a fairly long sickness absence. Person A manages person B in a team environment.

Person B has a diagnosed medical condition which can cause problems at work when it flares up affecting performance and output. This is recently diagnosed, and before this person B worked at the company for 25 years without issue. Person B has requested a couple of minor changes to help manage at work as well as a phased return.

Person A disagreed with some of the changes and deemed them unnecessary. They feel that Person B is capable of doing the work without any adjustments. Person A discussed this openly in front of colleagues with person B present and informed person B that they did not need the adjustments they had requested.

Is this a confidentiality breach if the actual diagnosis wasn’t mentioned?

YABU - Person A is unreasonable
YANBU Person b is unreasonable

Surely this should have been discussed in private between A and B?

I agree it wasn’t appropriate to discuss this in front of colleagues, but I’m not clear that it was a breach of confidentiality.

Person A discussed this openly in front of colleagues with person B present

It would help me to know what person A said to the colleagues. Was it something along the lines of “B wants to work from home once a week. We’d all like to do that, though.”

… informed person B that they did not need the adjustments they had requested.
On what basis? Were there medical reports A was able to read, for example?