Phone can t find bridgr

I have a nuki opener, a bridge and a smart lock. Since a long time few years… i guess the first version. A few days ago, the brige went down i tried many time to reconnect via bluetooth but no chance…. So I bought another bridge i plug it manage to enter the wifi password and conect my phone to everything work fine for me. But not for all the users….!!!??? Impossible to connect via bluetooth to the bridge with phone of an other user.
I am totaly lost… can some help me thanks. (I guess i should i wrote this before buying a new one cause the problem is the same)

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