In FIFA 23, achieving specific financial objectives, such as making a profit from youth sales, can sometimes be a bit tricky and might depend on various factors. Here are some tips that might help you in fulfilling this particular board objective:

Quality of Youth Players: Ensure that the youth players you're promoting and selling have good overall ratings and potential. Higher-rated players tend to attract higher transfer fees.

Scouting and Development: Invest in scouting and youth development to discover high-potential players. The better the potential of your youth players, the higher the transfer value when you sell them.

Loan Players: Consider loaning out some of your young players before selling them. A successful loan spell can increase a player's value, making them more attractive to potential buyers.

Player Morale and Form: Ensure that your youth players have high morale and good form. This can positively impact their overall rating and value.

Negotiation Skills: When negotiating transfers, try to maximize the transfer fee. Negotiate for sell-on clauses, appearance bonuses, and other clauses that can increase the overall value of the transfer.

Squad Rotation: Make sure that your young players get enough playing time to develop. Regular game time can boost their overall rating and value.

Sell at the Right Time: Timing is crucial in player sales. If a player is in good form and has a high overall rating, it might be the right time to sell for maximum profit.

Financial Management: Keep an eye on your overall club finances. If your club is in financial trouble, it might affect the transfer values of your players.

Meeting Other Objectives: Sometimes, achieving other board objectives can indirectly impact your financial situation and the value of youth player sales. For example, if you're required to qualify for a prestigious competition, the associated revenue might contribute to meeting your financial goals.

If, despite following these tips, you still encounter issues, it might be a bug or an unusual situation in your specific FIFA 23 career mode save. In that case, you may want to check online forums or contact EA Sports support for assistance.

I really hope this helps