Hope someone can assist with this DNS/Redirection issue. I'll try to keep this to the point.
There are two domains and two subdomains to deal with.
olddomain.com is with registrar A. newdomain.com is with registrar B. Neither registrar is our web host and neither can do a 301 redirect (they did a 302 instead when asked for a 301).
Web host is Duda, a site building platform similar to Wix, who do not host domains.
olddomain.com needs to point to www.newdomain.com
www.olddomain.com needs to point to www.newdomain.com
newdomain.com needs to point to www.newdomain.com
www.olddomain.com has many backlinks associated with it.
newdomain.com also has a lot of high value backlinks associated with it.
All those backlinks are currently being "lost" and also Google is seeing newdomain.com and www.newdomain.com as duplicate content which I think is down to incorrect DNS records.
New site was rushed through for internal commercial reasons without regard for the SEO side of things so hence this predicament.
Can this be solved even though I can't host the domains with the site host?
I have limited technical understanding in this area.
Thank you very much.