If you’re already subscribed to Clue Plus, you can still link your Clue account with Gympass. Just go to the Clue page in your Gympass app, activate the partnership, and then sign in to your Clue account.
Once your current Clue Plus subscription ends, you can then start using Clue Plus with your Gympass membership. This will happen automatically. If you’re enrolled in auto-renewal, you’ll need to check in with your App Store or Google Play Store settings about when your current subscription ends.