I agree with adding the landmark. Not sure about the arialabel. Will check in more detail later but I don't think it's needed or particularly helpful

I would like to have a landmark here and get rid of this ugly "missing landmark" error.
But am not sure if <aside is correct.
Semantic meaning is "content which is relaed to the main content and supports it".
We can define modules - there we know when the module is related to the main content.
But sidebar could be everything.
Would be interesting to know if the <aside helps blind users and has a meaning

Aside means it is complimentary to the main region but I wonder if it can be considered as complimentary as it has the page h1 in it.

The <aside> HTML element represents a portion of a document whose content is only indirectly related to the document's main content. https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/aside

This suggests it's not the correct landmark region to use here

A <div role="complementary" could match.

A <div role="complementary" could match.

that is the exact same thing as aside https://www.w3.org/WAI/ARIA/apg/patterns/landmarks/examples/complementary.html

Not sure about the arialabel. Will check in more detail later but I don't think it's needed or particularly helpful

I was surprised that the label would identify the text as the referred id is to the div and not the individual text. So that arial label is both the h1 and the h2

In general a region only needs a label if there are more than one on the page but i dont suppose it harms having one anyway.

I wonder if this is the real main region on the page and its the login that is either complimentary or region https://www.w3.org/WAI/ARIA/apg/patterns/landmarks/examples/region.html