@WinterHC unfortunately you were scammed by an imposter.
Both the Discord accounts are imposters.
This was a so-called 'man in the middle' scam. You were talking to an imposter and the imposter had a second account that he contacted the real Nexus RSPS on (he did this one nullable discord). This led to Nexus RSPS sending you a confirmation PM on Sythe using the keyword "apple".
The discord unique id or discord tag doesn't match either, if you notice the nexus discord you traded was .nexusservices67 while the real nexus discord tag is nexusservices67 (notice the . at the start) and their unique discord id doesn't match.
Please check the UID before trading next time, as this can prevent scams like these.