Friend doesn't see me online

Hello!
I have found myself in a very strange situation.
One of my friends can never see me to be online, no matter how many times I change device or status.
I have tried in my phone, tablet and pc, uninstalling the battle.net mobile app and changing my status on all my devices to no avail.

After all these attempts I was wondering if maybe someone here could aid me.

Many thanks to you in advance indeed!

EDIT:
Just in case both are within the same region and even wifi. I can also see her connected and even invite her to play, though it gets autocancelled since for her I am “offline”

Make sure that this friend is connected to the same region as you.

We are both in Europe indeed

has this been fixed? have tge same problem with a friend since about 3-4weeks. or maybe longer

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