Hi Katia,
Are you using Atlassian Guard for your MFA with something like MS authenticator? Or are you using OTP's? Also what authentication policy are you using?
I'm just trying to understand the JIRA setup to understand the RDI configuration, if that helps. I appreciate that this doesn't answer the question however, I'm just trying to under the environment a bit more.
I assume the MFA works outside of the RDi.
Many thanks in advance