Here is a minimal flow you can try:
2. Click +Create , Choose Automated cloud flow
3. Give it a name, Choose your flow's trigger,
search When a new email arrives (V3) if you use office365, When a new email arrives (V2) if you use outlook.com
4. Choose Advanced parameters accordingly.
5. Click +, then search Condition, and choose it.
Choose the first box, and click fx, then type formula
toLower(triggerOutputs()?['body/from'])
choose contains in the dropdown list.
The right one, type client_tester_xyz
6. Inside true. click +. Add Move email(v2). if you use outlook, choose Move email.
Message id: ( type or copy below)
@triggerOutputs()?['body/id']
Folder : choose your own folder.
that's it.