NVDA not reading text with background images in Outlook - outlook

Question

I've been trying to make our emails more accessible but NVDA seems to have trouble reading text when there's a background image in Outlook. Could it be because of the VML or something else? NVDA can read it when I view in browser, but I feel like I shouldn't rely on that being used. I haven't been able to find a lot about email accessibility best practices, and nothing that discusses this issue I'm having. I'm fairly new to this so any suggestions would be appreciated.
Thanks!
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