All praise be to Allah Alone, and peace and blessings be upon His Messenger, and his family and Companions.
Istinshaq is an obligatory part of Wudu’ because it is authentically reported that the Prophet (peace be upon him) did Istinshaq and ordered Muslims to do it, by saying:
“The person performing Wudu’ should sniff water.”
He also said:
“The person performing Wudu’ should sniff water and force it out.”
Accordingly, if a person does not make Istinshaq, then their Wudu’ is invalid. You should repeat your Wudu’ and offer the above mentioned Salah again.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.