Microsoft Learn modules and exam assessments provide digital records of their completion rather than formal certifications. To earn a professional Microsoft Certification, you need to successfully complete a proctored exam or a series of exams which are separate from the self-paced learning content. While the modules act as the primary study guide and assessments help you prepare for the exam, covering the necessary curriculum, completing them only updates your personal transcript and profile achievements.
For a full certification, you should visit the corresponding MS Learn page (https://learn.microsoft.com/en-us/credentials/certifications/exams/ab-100/). The site will list exactly how to prepare for and take the exam. Once you pass it, the formal certificate will be issued to your profile.
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hth
Marcin