Run this command in sail project folder:
docker-compose exec mysql bash
execute the mysql -u root -p command
provide the default password password
then executes
# May be any user created with sail docker-compose
#
GRANT ALL PRIVILEGES ON *.* TO '<sail-user-from-docker-compose-yml>'@'%';and
FLUSH PRIVILEGES;that`s it!

@WhiskeyM1ke make sure you use the right username in your MySQL command!
In case your
DB_USERNAMEis laravalor in case your
DB_USERNAMEis sailAlso, make sure to flush the privileges
and exit afterwards