Validating DNS Issue of SPF records


My SPF records gets validated in several online testing sites, but when I try it from Mailwizz it never validates, it always throws an error as following:

Unable to find proper TXT record for your domain name, if you just added the records please wait for them to propagate.

What could be wrong out here?
@rags810 - If DNS propagates on various servers, doesn't mean it's propagated on all servers.
If mailwizz says it can't find the dns record, it simply means your server can't retrieve the updated dns records of your domain case in which you have to way but to wait.