3524844 - Issue with Language Setting in OOTB CommerceCommonI18NService

When visiting OCC users api, it attempts to set the session's current language using the OOTB CommerceCommonI18NService method setCurrentLanguage. Specifically, when the function is invoked with the language code "FR", the following error is logged:

java.lang.IllegalArgumentException: No matching DataLocale for gr ( tried [gr] on available locales {de=de->de, es=es->es, pt=pt->pt, zh=zh->zh, fr=fr->fr, en=en->en, ja=ja->ja, en_GB=en_GB->en_GB} ) at de.hybris.platform.servicelayer.internal.i18n.impl.DefaultLocalizationService.matchDataLocale(DefaultLocalizationService.java:233) at de.hybris.platform.servicelayer.internal.i18n.impl.DefaultLocalizationService.setCurrentLocale(DefaultLocalizationService.java:113) at de.hybris.platform.servicelayer.i18n.impl.DefaultI18NService.setCurrentLocale(DefaultI18NService.java:117) at de.hybris.platform.commerceservices.i18n.impl.DefaultCommerceCommonI18NService.setCurrentLanguage(DefaultCommerceCommonI18NService.java:189) at xx.com.xxx.xxxwebservices.v2.controller.B2BUsersController.getUser(B2BUsersController.java:83) 

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DataLocale, DefaultCommerceCommonI18NService, setCurrentLanguage, occ, user , KBA , CEC-SCC-COM-BC-OCC , Commerce Web Services - OCC , Problem