Likely because the government is a large enterprise customer who needs to not have a judicial precedent set. I.E. This seems a lawfare move to step back genera

Likely because the government is a large enterprise customer who needs to not have a judicial precedent set. I.E. This seems a lawfare move to step back general gag use, so that they can step forward again in specific gag use, rather than risk losing and finding future gags severely restricted. Microsoft is being polite because sometimes it might be reasonable for government to gag a subpoena, without it being a national security issue.