[Steve Van Doorn]

From page the Mueller report page 89
"the Special Counsel had taken over the Flynn investigation."

That suggests Mueller did put out a FISA on Flynn

https://www.justice.gov/storage/report_volume2.pdf

[semimojo]

That suggests Mueller did put out a FISA on Flynn

No it doesn’t.

No one needed a FISA warrant on Flynn because we were already (legally) monitoring the Russians that he talked to.

No one is claiming there was a FISA for Flynn and the FBI never cited any evidence from FISA surveillance.