Hey imarines.2022! We want to start by saying welcome to the Meta family! We do understand how not receiving Beat Saber is causing you some discouragement. We want to do everything we can to get you Beat Saber and into the great world of VR!
The download link for the Beat Saber promotion is sent to the account's email. We can see from what you said that you have it and clicking on it causing you trouble. For better help with this, we kindly ask that you open a ticket on our Support Website. While we do wish we could help you from here, we do have limited resources that we can use.
There you'll get in contact with one of our amazing agents, who will work tirelessly to get you into Beat Saber. When you contact an agent, please be prepared to provide a screenshot of the error message you see after clicking the link. We look forward to assisting you there and getting you into Beat Saber and VR!
Here are some things you can try:
Let me know if one of these works for you. 🤞