Canonical URL is not among the hreflang URLs
hreflang.canonical_conflict
What it means
The canonical points to https://example.com/a, which none of the hreflang links names. Crawlers may ignore the language cluster.
Priority
P2
How to fix it
Run a free check of your page. The report shows the evidence for this finding on your site and a ready-to-paste fix: a robots.txt change, a Cloudflare rule, JSON-LD markup, an llms.txt draft or a short instruction.
How to confirm the fix
After the change, press "Check again" on the report: it lists what was fixed and how the score changed.