This is probably a noob question but...My MyCelium wallet is unable to send BTC to certain other addresses. For example, I also have a BlueWallet on my phone, and when I attempt to transfer BTC from MyCelium to BlueWallet, MyCelium prohibits me from sending. Does anyone know why this might be?
What is the exact form of the address from Blue wallet that you are attempting to send to? Mycelium supports all the standard Bitcoin address types - Legacy ("1"-type), P2SH ("3"-type) and bech32 ("bc1"-type) addresses...
I do knot that Bluewallet also supports using Lightning Network... so, I suspect you might be attempting to send to a "Lightning" wallet from BlueWallet... Mycelium is not compatible with the Lightning network at this time.
It's the bech2 type address, my MyCelium wallet is unable to send to those.