The steps are correct for Active Active setup, I would assume that the crypto key may have a problem. Try restarting the Management node and ensure that the webconsole can load successfully. Then try downloading the crypto key from the Management node appliance page again.

Thanks,I tryed that but no success for now.

One thing,maybe it is important. Do I need to have SQL Always on for this active - active config or it is enough to have a simple SQL 2019 Standard external server.

For  managament node I choose  Database Server in a Multi-Node Deployment from solution and for worker node I choose  SQL-less Appliance  like it is written in BT knowledge  article  

KB0020105 -

Password Safe High Availability Active Active considerations when deploying

I saw that there was no answer to your last question. I wanted to confirm, that SQL Always On is indeed a requirement for an Active/Active environment.

https://docs.beyondtrust.com/bips/docs/bi-best-practices#activeactive-deployment-model

Thanks, this confirmation is what I needed