Xbox multiplayer XP cap

I am currently level 16 and and unable to complete any more challenges on Xbox 1X. Due to this fact, I can no longer gain XP as challenges are the only way to rank up.

Is this a glitch for having no new daily challenges as it simply says completed?

Many people experiencing it. If you have 800 credits you could always buy the last 4 tiers.

I was stuck on level 6 for two days.