From my point of view and this is what the hospital staff/nurses have said, to me is they are so used to seeing family members misuse the relative, who is in hospital for example "stealing from them". That they have to use "safegarding" if they have any "suspicion" and to deny the person from seeing the paitent. If the patient doesnt want to see them.
My mum because she had a stroke accused me of stealing from her and that is what brought on the animosity, they had also asked her if she wanted to go into a carehome, without asking me to be there with her even though they said, they would include me in with important decisions.
From what I have read about dementia is sometimes, the person who has it tends to get it into their mind that a loved one, has done something "wrong" to them and they truly believe that,and then they tell other people and those tend to believe them, and put in the suspicions to the hospital staff or care home staff and then things like not being able to see or visit you're family member happen.
When this happens, I understand about them"safeguarding" their patients/residents but why they can't be more transparent, like for example such and such has accused you of doing this,and that is why we are obligated to not allow you to see them, until we have spoken to the authorities and gathered evidence. Instead of just saying your guilty till proven other wise is beyond me.
Also yes they could have been more understanding and give some compassion even if they are "busy" I don't think it would hurt them to just type a valid reason in a email to you as to why you can't go in, it would save all this time and worrying, and yes it's horrible that you are being treated this way and not being told why and to have to chase around for an answer when they could just tell you instead of defecting, I hope this gets resolved fast for you, I know how upsetting not knowing is and not being allowed to see the person you care about, you have my condolences and best wishes💐💐