Hello Dejef2 ,
Are you sure you logged into Ultimate Team, not only the game ?
Unfortunately, we are unable to unlock access manually.
You mentioned that you got the game recently, make sure you complete your starting squad and some foundation objectives and try again to access the web app.
I'm also sharing with you two articles to help you unlock the transfer market on the web app:
How to unlock the Transfer Market with Graduated Access in EA SPORTS FC™ 26
EA SPORTS FC™ Transfer Market access on Web & Companion Apps
Those articles should go into details on what you need to do.
Good luck.