I don't know if any of you have encountered the "Access denied" or 403 error when accessing WordPress tags. I searched online but couldn't find a solution.

Access denied error.

403 error.

Finally, I found out that the conflict was caused by the alias of the tag colliding with a system reserved name. For example, I was using a tag with the name and alias "phpmyadmin". The solution is to modify the alias of the tag. Go to the backend >> Posts >> Tags >> search for the name of the tag, and then modify the alias.

Modify the alias of the tag.

After updating the tag, click to view it again, and it should work normally.