An update. I've had no problem using the ST E+ services in both MAN and CDG. In MAN they looked very carefully at my documentation and then let me into the lounge (the temporary card itself wouldn't have been enough because it doesn't have the validity period. The e-mail I got from OnePass does). In the CDG 2F lounge they let me it very easily.
The AF lounges are not up to par with LH SEN lounges - but I had read about that so it wasn't a surprise.
Will report later on whether I have similar luck with AZ.