In an “ideal Scrum situation” you will not share roles.
Scrum master and team member
Sometimes a conflict of interest may arise between them, which must fulfill its task and must remove the obstacle that a team member has reported. In each of their roles, they “commit” to fulfill their role until the end of the sprint - what should take precedence? However, this is actually probably the most common combination of roles.
Product owner and team member
You really should never have the same person who would agree to work for both full and final work and actually do the work. This should happen only in the company of one person, and in this case, you may question the idea of ​​using Scrum in the first place
Scrum master and product owner
Again, I see a potential conflict of interest between the Scrum master who wants to complete the sprint as it was done, and product owners must agree with the statement that the sprint was accepted.
Paul rowland
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