for some reason the remmina rdp isn't working with linux clients (Raspbian version, latest as of March 2021).
There's a command line invoked utility, rdesktop that works well.
rdesktop -u <user id> <ip or dns name>
the -f will launch at the full screen of the local client screen. <ctl><alt><enter> exits full screen so you can exit rdesktop. Works fine with windows and linux systems rdp servers.
sudo apt install -y rdesktop
sudo dnf install rdesktop <centos 8 and RHEL 8>
sudo yum install rdesktop <fedora, other RHEL>
https://www.tecmint.com/rdesktop-connect-windows-desktop-from-linux/
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