Is there any physical separation, damage or open seams at the union strip? If so, that should be repaired before any sealing takes place. If there is no damage, no physical gap visible, then I'd clean the area well, remove any loose or damaged sealant, clean with alcohol and reseal with DICOR self leveling sealant. Be sure to overlap ALL the existing sealant with the new coat.
Once that is done, you should be OK. Eterna-bond tape is an alternative, but application of that tape is considered a "permanent application" and the tape is extremely difficult, probably impossible to remove without damaging the TPO roof membrane, so use it with the understanding that you won't be able to remove it for future repairs or upgrades.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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