This is what I got in the request letter:
"This refers to your application for permanent residence in Canada. I am writing you this letter to express my serious concerns regarding your application. I have concerns that you have not accumulated at least one year of full-time work experience, or the equivalent in part-time work, in the occupation identified as your primary occupation,NOC 4163 You have declared that you have been employed at XXX as Market Research Analyst from 2017/05 until 2018/10 as is stated on the letter of employment that you have provided. However, your declarations contradict with the information provide. Following review your passport, I note that you hold an F1 –visa for student not a work permit. Specifically, I have concerns regarding the genuineness of your work experience with XXX. Therefore I am asking you to submit any additional information/documentation that would allay my concerns. You have 30 days from the date of this letter to submit the additional information. Please reply directly to this email and put your application number in the title."