Hey there @nick18!
I apologize for the delayed response here - I just tested this out myself using go-Auth0 and am experiencing the same thing.
I think it’s a known issue that multiple strategies won’t work in the Management API Explorer (annoying), but I was able to filter based on multiple strategies in Postman like: https://{{auth0_domain}}/api/v2/connections?strategy=auth0&strategy=google-oauth2
I just opened up a discussion internally to see if this is possible in the Go SDK - I’ll keep you posted!