Unable to Redeem Secrecy Enforcement Agency clothes due to "full inventory" error?

[Rooibos]

This issue should be resolved as of today’s update:

Update 2.3.1 (Stonehenge Group)

February 8, 2019 NEW Love is in the air! Claim a FREE Bag of Saint Valentinus for a limited time, and check out classic Valentine’s gear made with love! Look for specially-marked items in the pet, sprint, and dressing room windows. Event ends February 15th 2019! GENERAL Fixed an issue preventing some players from being able to add the Secrecy Enforcement Agent outfit to their dressing room.