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Hello,
Maybe one thing that could explain that : keep in mind that AZ-300 and AZ-301 (path for Azure Solutions Architect) will be removed in July.
These 2 certifications will be replaced by the end of April by AZ-303 and AZ-304 that are already available (currently in Beta). More informations by following this link : https://learn.microsoft.com/en-us/learn/certifications/exams/az-300. However, no constraint about going on the old one because it will give you the same certificate. It's just the learning path will be slightly different.