Form Recognizer is only available in ~70% of regions, see https://azure.microsoft.com/en-us/explore/global-infrastructure/products-by-region/?products=cognitive-services and search for "Document Intelligence".
I'm considering a few options for increasing the deployability:
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Restrict the overall location based on locations where form recognizer is available
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Add a location specifically for just form recognizer with just its regions (that increases the number of things to fill out though)