It is acceptable to sign documents electronically, in the same way that a signature on a document that has been faxed is acceptable.
Where you must be careful is the method by which the signed document is served or delivered. Review the Certificate of Service to learn about the various methods of service allowed under the Residential Tenancies Act. You can watch our Landlord Learning Module at https://youtu.be/_719nZX6UEw?si=KYdRDhLbX-tiitO3 or listen to our Sound Advice podcast episode at https://landlordselfhelp.com/podcast/certificate-of-service/