If you are referring to Uphold specifically, that would be best for Uphold to answer/confirm directly.
If it’s in regards to how many devices you can have connected to Brave Rewards, regular linking limits were removed with the exception of Bitflyer. This went into effect May 25th, 2022.
Please note, the linking limit setting is based on standard device habits. If you are seeing an error message, it may be due to irregular usage.