Randy Kosarik
Ansys Employee
Hi Danielly This is occurring in the AEDT Message Manager when interactively solving?
-- Does HPC and Analysis Options have "Enable GPU" set for the design type?
-- Does HPC and Analysis configuration have a value in the GPU's column?
-- Are you able to share the output from "nvidia-smi -a" and "lspci -vnn | grep -A 12"?

Although, unlikely related - please see the Platform support pages at: https://www.ansys.com/it-solutions/platform-support
RHEL 8.3 is not yet certified/supported.