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When an image is used for functional purposes eg a link then then alt text should describe the function and not the image. Otherwise the link may appear to be empty to assistive technology and therefore ignored.
https://www.w3.org/WAI/tutorials/images/functional/#image-used-alone-as-a-linked-logo
In the atum template the logo in the top right is sometimes used as a link to the homepage. So in those circumstance it needs an alt text that describe where the link takes you that and not an aria label on the image.