@Michael_Soprano  if possible move the event attribute as it is time-series type and the profile will store on one value not the historical - hence would not give you the expected segmentation.. 

@SwetaRani  considering using HTTP API solution using https://developer.adobe.com/experience-platform-apis/ via serverless function

@_Andy_  no it should also support UK , if not working suggest you open an Adobe ticket or @kautuk_sahni  can you tell what would be the right option here for @_Andy_  for reaching out to Adobe support.

@_Andy_ did you mean on the cloud/ Admin profile as suggested in the shared link?

@SnehalBh1 can you refer post below for similar issue https://experienceleaguecommunities.adobe.com/t5/adobe-target-questions/vec-error-action-could-not-be-applied-due-to-missing-or-invalid/m-p/450482 

@SubeAEP understanding is the same scenarios when account type was A and now the Type is B- Is that right?if it is profile schema then the time-based/update record is not maintained.  One option could be  to update the existing schema using the profile service considering u have detailed historical ...

@_Andy_  check your or with admin have permission to change the locale this might change setting to UK locale which is DD/mm /YYYYhttps://experienceleague.adobe.com/en/docs/core-services/interface/features/browser-language

@MatthewMu5 can you confirm which Target extension you are using in Adobe Launch, should be V2- has support for SPA

@MadhuS7  did you check how data is being ingested considering the error seems to be a mismatch between data ingestion and evaluation because of that you are getting the error, may be try again with a fresh connection and corresponding setting / discussed in prior comments. Once ingestion is complet...

@Harveer_SinghGi1 given link is for streaming ingestion on WebSDK, my understanding is that the question is for WebSDK , where data goes to EdgeNetwork / Kafta pipeline before going to the data lake - my experience it will hold only payload which is mapped to the data stream, not everything