Okay, I manage to solve this issue by doing these steps:

• Clean all Mapbox folders.
• Go to assets>import package>custom package and then select the Mapbox package 2.1.1 and select only the necessary folder, in my case just MAPBOX folder.
• go to Mapbox>core>plugins>android and delete support-v4-25.aar file.
• now in the menu bar go to edit>project preferences and the select android logo, go to the 'other settings' section and select minimum API in 24 and target to 34.
• close unity and in the root folder delete Library, Temp, Obj and Build folder (the ones you have)
• open the project in unity and wait several minutes
• now it will ask you to switch platform and after that it will show build button.

This should solve your problem, men. Remember that if for any reason you want to export to Android 15 then you need to migrate to Unity 6, no other solution.