Alt tag Missing on Main Logo

Hi

I have read a number of queries on this issue however none seem to me have a clear resolution which solve my problem.

On Rank Math SEO Analysis I am told my logo does not have an ALT tag yet within my WordPress Media library it does have an Alt tag labelled ?

Rank Math advise me that my logo URL is returning a 404 error.

With the site logo linked to my ASTRA theme I have also tried updating that with no luck.

I am going around in circles and would like some assistance before I go mad !

thanks

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