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Tubless tyre not sealing by the valve

Looking foir some inspiration. I have a Zipp 30 rear wheel that I am trying to fit a Continental GP5000 TL tyre to. The front went on fine, no issues, seated & sealed with no problem. The rear does not seal on the non-driveside by the valve though the rest of the tyre seals fine. I have tried moving the tyre so that a different section is by the valve to confirm it is the rim not the tyre but get the same result. Any ideas?

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