Since you had already started the tournament as an Amateur, you will not be able to play in that tournament with Pro tier clubs. You can continue to play in it, just not with Pro-tier equipment.
Any tournaments that you join moving forward you'll be able to use the Pro-tier clubs.
Just for now.
You'll be able to enter and use those fancy new clubs in next week's weekly tournaments, and the end of the month is only a week away which will mean lots of new tournaments to compete in.
Cheers.