You may have copied a black space after the addresses, such as "36XRdQsT7iX....8D7RdaCvL ", this blank space in the end may be causing the problem.
Just tested this in Mycelium.
I added an extra space at the end of the address and didn't get any error.
If I add any other character, it says "Invalid Bitcoin Address".
I'm copying the address directly from BlueWallet and pasting into MyCelium. It seems to be an issue w/ BlueWallet, not MyCelium, but the address's from BlueWallet are too long and generate an error message w/in MyCelium.
You are probably doing something wrong.
I have bluewallet in my android phone and it works with no problem.
Can post screen shots if that will help,
Post the screenshot. It should be helpful.