Make notifications on Eufy Doorbell more reliable - let the bell ring longer

Hi,

I use the Doorbell for a bed and breakfast. When guests are ariving they ring the bell. Sometimes, when doing other stuff, I dont hear my phone or the phone just vibrates ones (one time for one ring). Btw, it’s usually in vibration mode.
Is there a way to let the doorbell vibrate more often (like a call until I answer or decline it)?
That would be really helpful because I already missed some visitors coming to me.

Regards
Chris

is there any answer of this?