Lauryn Hey 👋,
you can see the IBAN of every account by selecting the account you want to know the IBAN in the home Tab. The IBAN can then be found on the top aligned. Every IBAN can receive and send money, so what exactly didn’t work when you tried to send money to one of your IBAN?
As you are a relatively new user (since yesterday?) it can be, that the IBANs are not yet recognized by the banking system of the other banks, but should work in due time.
🌈 Here’s some knowledge about IBAN:
https://together.bunq.com/d/2880