How to prevent less spam accounts and better verify users inside our b2b mobile app sign up process — SSO, something else? We’d prefer to not use Linkedin SSO, more inside…

LinkedIn has restricted more and more SSO capabilities and as we're about to launch our new mobile app for b2b sales/marketers, I'm looking for a way when users sign up to prevent multiple accounts (as best we can) in our mobile app from one user.

SSO is an idea, and Twitter works fine but not everyone's on Twitter.

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I'd just prefer to not include FB at all.

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LinkedIn makes sense but not in a SSO way that I like, maybe 'fill out form with your LinkedIn profile' and not let users edit (if possible), but again we're a mobile app so unsure if that makes a lot of sense UX wise.

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The issue I have with more than one SSO option is it allows for multiple accounts. Ideally we just use one if we have to, or is there another service others have used for a similar use case?

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Preventing multiple accounts from one user is the goal. SSO is a way to at least do it that takes effort, but I'm open to options.