How to assign peer review groups after students have started to submit?

[ZenaidaPirri]

Instructor never got to manually assign groups and 4 students have posted/ submitting already.  Students are just responding to the posts.   Is manually setting up groups an option?  I attempted to request Automatically Assigning groups but even-though Canvas shows my selections (3 peer reviews per user/ Automatically) students still show as not having been assign to a group.  How can we best assign groups at this point?  Thanks!