My phone number is not showing that it’s attached my my tik tok account

So, I was looking at my account settings and had seen that my TikTok didn't have a number or email attached to my account, and I thought it was strange because I'm pretty positive I used my phone number to make that account years back. I tried to add my number, but the verification code isn't sending, so I'm confused. Is this happening or happened to anyone else?