Hello Talia,
Please check below points,
- The name shown in your screenshot looks auto-generated and contains uppercase letters(this alone will disable the Create button.) Rename it to something like: azurefunction112520251203103535 mycompany-func-app proj123api
- Storage account Exist in the same region as your Function App. Please confirm on above suggested steps.
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If you have any other questions or are still experiencing issues, feel free to ask in the "comments" section, and I'd be happy to help.