Error installing Job Server

We are installing version 8.1 of the product and we have a serious problem when installing or defining the Job Server. The error code is as follows:

Error during execution of statement: 
insert into QBMServerHasDeployTarget (UID_QBMDeployTarget, UID_QBMServer, xdateinserted, xuserinserted, xdateupdated, xuserupdated, xobjectkey) 
values ('ADS-AA65D060C911BA5666BA87CC037603FD', '32a4d52f-b77d-4c94-b830-c26d95229c06', GetUTCDate(), N'cccAdmin', GetUTCDate(), N'cccAdmin', '<Key><T>QBMServerHasDeployTarget</T><P>ADS-AA65D060C911BA5666BA87CC037603FD</P><P>32a4d52f-b77d-4c94-b830-c26d95229c06</P></Key>')
The database connection was broken.
Cannot continue the execution because the session is in the kill state.
A severe error occurred on the current command.  The results, if any, should be discarded.

We have tried to make the insert both with the viAdmin user and with a system user created by us.

The database is SQL Server 2016 SP2 CU6

Can you give us a hand?

Any additional information you need to tell us.

Thank you.

Regards.