Hi Jorge,
QGIS Windows installers use now Python 3.9 as stated in
https://qgis.org/fr/site/forusers/download.html
Also, as stated in the same link when clicking on Windows.
*CAUTION:* Windows 7 no longer works as we are now using Python 3.9,
which dropped support for it.
That explains why
I believe there is a bug in the QGIS WFS GetFeature request. Can someone
verify? I have tested this on Windows with QGIS 3.16 up through 3.20. I
found it because QGIS is failing with one of our WFS servers. The WFS
specification for 1.0.0 and 1.1.0 specifies that one form of the SRSNAME
urn