1st aid hotline - does not call when in focus mode

Hi everyone,

i created a 1st aid hotline for one of our bigger branches.  The goal is to call the hotline - it rings at 20 ppl at once. The first to answer is the 1st aider.

But we are also using "Focus time" to block time slots.

I added the hotline to my priority contacts and disabled "busy on busy" but the call does not get through. As this is a life saving procedure i need to make sure that all call come through. It does not matter if you are presenting, in a meeting or sitting on the toilet with only your phone. 

Can someone help me out which setting i should make? The branch is in Germany and normally the hotline will be called from mobile.

BR

Stephan