Router LTE and Mikrotik

Hi guys i hope somebody could help me

i have this network configuration

LTE Router 4g---------->Mikrotik Router Site A
Mikrotik Router Site B

I need to create an IPsec tunnel between this to site

I had configured mikrotik router Site A in bridge mode on LTE Router but i can’t established the tunnel.

is the first time i configured lte router like that(i had create more tunnel on mikrotik site B without any problem)


Thanks for the time
Mark