You have to have a valid residence permit even though you have applied for Norwegian citizenship
Unless you have a permanent residence permit or have applied for one, you must remember to renew your temporary residence permit while waiting for your citizenship application to be processed.
Your application for citizenship will be rejected if you do not have a valid residence permit – or if you have not submitted an application to renew your temporary residence permit – by the time we process your citizenship application.
Your application to renew your residence permit must be submitted before your previous permit expires.
It can take a long time to process an application for Norwegian citizenship. As a consequence, the vast majority of those who apply for Norwegian citizenship without a permanent residence permit, and without having applied for one, will need to renew their temporary permits during this time. If you have applied for a permanent residence permit, however, it is not necessary to apply to renew your residence permit.