Update matrix-domain.conf.j2

also change the order of "set $backend" and "rewrite" here in the 3pid registration section

roles/custom/matrix-nginx-proxy/templates/nginx/conf.d/matrix-domain.conf.j2

@@ -206,14 +206,13 @@
 
 	{% if matrix_nginx_proxy_proxy_matrix_3pid_registration_enabled %}
 	location ~ ^/_matrix/client/(r0|v3)/register/(email|msisdn)/requestToken$ {
-		{% if matrix_nginx_proxy_proxy_matrix_3pid_registration_v3_to_r0_redirect_enabled %}
-		rewrite ^(.*?)/v3/(.*?)$  $1/r0/$2 break;
-		{% endif %}
-
 		{% if matrix_nginx_proxy_enabled %}
 			{# Use the embedded DNS resolver in Docker containers to discover the service #}
 			resolver {{ matrix_nginx_proxy_http_level_resolver }} valid=5s;
 			set $backend "{{ matrix_nginx_proxy_proxy_matrix_3pid_registration_addr_with_container }}";
+   		    {% if matrix_nginx_proxy_proxy_matrix_3pid_registration_v3_to_r0_redirect_enabled %}
+            rewrite ^(.*?)/v3/(.*?)$  $1/r0/$2 break;
+	        {% endif %}
 			proxy_pass http://$backend;
 		{% else %}
 			{# Generic configuration for use outside of our container setup #}