Non-custodial accounts, like the ones managed with XUMM, do not have destination tags/memo IDs.
Sometimes, when withdrawing from an exchange, there is a box to check, eg. "No destination tag" but in some cases, the sending platform forces (requires) you to enter a destination tag. If you are encountering this, try entering a 4 digit number like: 1234
We understand that you might have additional questions regarding this issue, so you are welcome to contact us any time via the XUMM Support xApp in XUMM or you can simply scan this QR code with XUMM and be directed there automatically.
Finally, if you are interested in learning more about destination tags/Memo IDs, you may find this video helpful...