There are many ways to do anything. Some build "in public", e.g. on Twitter/X and blog about every step. Some release early with previews/beta and keep going. There's no hard or fast rules.

I definitely think you can release something and also talk to customers. I mean why not? Try again later. Keep improving as you do this.

I doubt something like SSO is going to be a blocker at this stage. Perhaps something else.

Can't say more without seeing the product though...