There could be several reasons why your TikTok ad budget isn’t being spent:

1. Targeting: If your ad targeting is too narrow, there may not be enough impressions available to spend your budget. Try expanding your target audience or adjusting your targeting criteria.
2. Competition: If there is high competition for ad space within your target audience, your ad may not receive impressions even though there are enough impressions available.
3. Budget: Make sure you have set your ad budget to an appropriate amount and that you have selected the correct budget type (daily or lifetime).
4. Ad creative: If your ad creative is not resonating with your target audience, it may not receive impressions or conversions even if your targeting and budget are set correctly.

It is important to regularly monitor and analyze your TikTok ad campaign performance to identify any issues and make adjustments as needed.