You need to get the SPF record from your Microsoft account, under SETUP and DOMAINS, there's a tab "DNS records." You should see the SPF record you need to enter as a TXT record for Wix.
For the DKIM, while still logged into your account, go to: https://security.microsoft.com/authentication?viewid=DKIM
Select your domain and enable DKIM. It will present an error. In that text are the two CNAM records you need to add to Wix. There are two parts, the HOST and VALUE. Make sure you have them entered properly in your Wix DNS.
Once you get the records in place in Wix, wait a few minutes and retry turning on DKIM on the Microsoft site. Once the records are posted, you won't get the error and DKIM will be enabled. Microsoft has to see the records in your DNS before it can turn on.